Carbamates, their production and use as fuels additives

Details Carbamates, their production and use as fuels additives Carbamates, their production and use as fuels additives

1991-07-29

1992-06-30

Howard, Jacqueline

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

44387, 44329, 560157, C08G 6532, C07C12506, C10L 122

Patent

active

051264773

ABSTRACT:
A process for the production of a carbamate suitable for use as a detergent additive to internal combustion engine fuels which process comprises reacting either ammonia, a primary amime or a secondary amine with a dihydrocarbyl carbonate in the presence as catalyst of a strong organic base and in the proportions necessary to produce either a mono-carbamate or a bis-carbamate. A process for the production of a carbamate having formula (I), wherein X and Y are independently either hydrogen, a hydrocarbyl group or a hetero-substituted hydrocarbyl group or the group of formula (II), wherein Z is either a divalent hydrocarbyl, a substituted hydrocarbyl group or the group of formula (III) [alkytene)m(NH)n(alkylene)m] in which n=0 to 4 and m=1 to 4, and R is a hydrocarbly or substituted hydrocarbyl group, provided that if either one of X or Y is the group of formula (II), the other of X or Y is hydrogen, which process comprises reacting a compound of formula (IV), wherein X and Y are independently either hydrogen, a hydrocarbyl group or a hetero-substituted hydrocarbyl group with a dihydrocarbyl carbonate having formula (V), wherein independently R is as defined above in the presence as catalyst of a strong organic base and in the proportions necessary to produce either a mono-carbamate or a bis-carbamate.

REFERENCES:
patent: 4268683 (1981-05-01), Gargiolo
patent: 4268684 (1981-05-01), Gargiolo
patent: 4537986 (1985-08-01), Reissenweber et al.
patent: 4659845 (1987-04-01), Rivetti et al.
patent: 4725680 (1988-02-01), Barcelo et al.

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